But their day didn't end there! Later in the evening, Will and Kate switched up their looks and attended a special garden party in honor of the queen's birthday at Lazienki Park. Will even gave a speech to the crowd, saying, "Tonight we have double reason to celebrate, we mark the birthday of my grandmother, the queen, and we mark the depth and breadth of our two great shared countries."

On Tuesday, the couple then had a solemn visit to the Stutthof concentration camp as they met with former prisoners and signed a book of condolence. Afterward, they headed to the town market in Gdansk, where they were met with a huge crowd. While their parents conducted their official duties, George and Charlotte reportedly stayed behind with their nanny, Maria Turrion Borrallo, before touching down in Berlin, Germany on Wednesday.